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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 223 · 40 questions
TalentJR

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

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  1. 1.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  2. 2.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
  3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
  4. 4.True or false: to leave fridge door open saves electricity. (a) False (b) True
  5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  6. 6.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) unplug idle chargers (d) switch off empty rooms
  7. 7.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  8. 8.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) iron one shirt at a time
  9. 9.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  10. 10.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  11. 11.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  12. 12.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  13. 13.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use old filament bulbs (d) switch off empty rooms
  14. 14.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  15. 15.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
  16. 16.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) iron one shirt at a time
  17. 17.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  18. 18.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) leave the TV on standby (d) use old filament bulbs
  20. 20.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) use old filament bulbs
  21. 21.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
  22. 22.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  24. 24.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  25. 25.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  27. 27.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers
  28. 28.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  29. 29.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
  30. 30.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  31. 31.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) use LED lamps
  32. 32.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) iron one shirt at a time
  33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
  34. 34.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  35. 35.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  36. 36.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  37. 37.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
  38. 38.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  39. 39.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  40. 40.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity

Answer key

  1. saves electricity
  2. an LED lamp
  3. set the AC to 24 °C
  4. False
  5. wastes electricity
  6. leave fridge door open
  7. True
  8. use daylight to read
  9. 1200
  10. True
  11. False
  12. False
  13. use old filament bulbs
  14. 1 kilowatt-hour (kWh)
  15. iron one shirt at a time
  16. set the AC to 24 °C
  17. 12
  18. 51
  19. close the fridge quickly
  20. unplug idle chargers
  21. leave the TV on standby
  22. True
  23. 136
  24. 10
  25. False
  26. 102
  27. leave the TV on standby
  28. 8
  29. use LED lamps
  30. 2
  31. leave fridge door open
  32. iron one shirt at a time
  33. unplug idle chargers
  34. True
  35. wastes electricity
  36. 10
  37. use LED lamps
  38. 1080
  39. 16
  40. saves electricity

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